End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://civils.farafile.ir/file/33451/جزوه-درس-نقشه-برداری-و-عملیات-مهندس-پناهی(دانشگاه-پیام-نور)